654 WEED FLORA OF IOWA 



Ceowns oe Shoet Offshoots. 



A long list of weeds produce heavy crowns near the .surface of 

 the soil. Stems spring from these crowns year after year. Parts 

 of the crown may become separated from the parent plant and 

 thus form an independent plant. Among the weeds so propagated 

 we find the dandelion {Taraxacum, officinale), white vervain {Ver- 

 bena urticaefolia) , plantain {Plantago lanceolata), catnip {Nepeta 

 oat aria), curled dock {Bumex crispus), smooth dock {B%mex 

 altissimus) , rib grass {Plantago lanceolata) , ox-eye daisy ( Chrysan- 

 themum leucanthemum) , 



